How to care for a moonstone bracelet

Can moonstone go in water?

Briefly, yes. Moonstone is not water soluble and not porous in the way turquoise or a pearl is, so rain, a splash, and washing your hands do nothing to it. You do not need to take the bracelet off at the sink.

The silver is the more sensitive half. Chlorinated pool water and sea water both accelerate tarnish on sterling, and chlorine in particular will dull a matte finish faster than months of ordinary wear. So the piece is better off on the edge of the pool than in it. Not because it will be destroyed, but because you will spend the next week looking at silver that has gone gray.

The other thing to avoid is leaving it wet. Water that sits in a setting, in the small gap where the stone meets the metal, is where marks come from over a long life. If the bracelet does get soaked, dry it with a soft cloth and pay attention to that seam. Ten seconds now saves you a dull spot later.

How to clean it

Lukewarm water, a drop of mild soap, a soft cloth or a very soft brush if something has dried on. Wipe, rinse, dry properly. That is the entire method, and it handles the thing that actually accumulates on a worn bracelet, which is skin oil and dust rather than dirt.

Two machines to skip. An ultrasonic cleaner works by driving vibration through liquid, and a moonstone is built out of thin internal layers and frequently contains small inclusions, both of which are places where vibration can find a weakness. A steamer adds sudden heat to the same situation. Jewelers use both on harder stones for good reason, and it is not the tool for this one.

Keep chemicals away from both halves. Bleach, acetone, and the household cleaners under the sink are hard on silver and no friend to a feldspar. Perfume and hairspray are worth a moment of thought too: spray first, then put the bracelet on.

The one thing not to do

Do not polish the coin. This is the single mistake that will actually spoil the piece, and it is the one a careful owner is most likely to make, because polishing silver is normally the responsible thing to do.

Here is why it is different here. The dark on the coin is not paint or plating. It is a thin layer of silver sulfide grown into the surface of the metal, and after it is grown most of it is rubbed back off by hand so that the raised surfaces return to bright silver while the dark stays down in the engraved lines. That contrast is the only reason the constellation is legible at arm's length. A bright coin with shallow engraving is nearly unreadable, because polished silver throws light in every direction at once.

Silver polish, polishing cloths and dip solutions all exist to remove exactly that sulfide layer. They cannot tell the difference between tarnish you want gone and oxidation that was put there deliberately. One pass with a treated cloth will lift the dark straight out of the lines, and the engraving goes faint.

A dry soft cloth is all the coin needs, and the good news is that it improves without help. Skin and cuff polish the high points a little brighter each month while the recesses go the other way and darken, so a coin worn every day for a year has more contrast in it than a new one. It is the rare finish that is made better by being used and slightly spoiled by being kept in a box.

What hardness 6 to 6.5 actually means

Moonstone sits at 6 to 6.5 on the Mohs scale. That number gets quoted a great deal without anyone saying what it implies, and what it implies is more specific than fragile.

The relevant comparison is quartz, which is 7. Quartz is harder than moonstone, and ordinary household dust contains quartz, which means the fine dulling of a polished surface over years comes from grit rather than from anything dramatic. It also means anything faceted in your jewelry box, and most stones set in rings are harder than 6.5, will mark a moonstone if the two are stored touching each other.

So the honest summary is that this is a storage problem rather than a wearing problem. Wear it every day. Give it its own pouch or its own corner of a drawer, away from rings and anything with a faceted stone. That single habit does more for the surface than any amount of careful handling while it is on your wrist.

On cleansing and charging

These two words come up constantly in searches about moonstone, and they come from crystal practice, where cleansing and charging mean resetting or restoring a stone's energy, often using salt, water, smoke, or a night of moonlight. We speak of meaning and history here, not powers, so I am not going to tell you what those practices do.

What I can speak to is the physical layer, and there the answer is short. A stone worn daily picks up skin oil and dust, and washing it as described above removes them. If a piece looks tired, it is almost always that and nothing else.

If leaving a bracelet on a windowsill overnight means something to you, that does the stone no harm at all, and neither does moonlight. One caution about the traditional methods, and it is a practical one rather than a philosophical one: salt is abrasive and hard on sterling silver. Dry salt, salt beds and salt water are the one common approach genuinely worth avoiding with a piece like this.

Everything else in that tradition is between you and the stone, and I have no standing to comment.

If you are still deciding whether a stone is what it says it is, the tilt test is here. For the wider context, moonstone is one of June's three birthstones, and the case for each sign is set out here.